WO2017191170A1 - Method for operating a fuel injector with an idle stroke - Google Patents

Method for operating a fuel injector with an idle stroke Download PDF

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Publication number
WO2017191170A1
WO2017191170A1 PCT/EP2017/060494 EP2017060494W WO2017191170A1 WO 2017191170 A1 WO2017191170 A1 WO 2017191170A1 EP 2017060494 W EP2017060494 W EP 2017060494W WO 2017191170 A1 WO2017191170 A1 WO 2017191170A1
Authority
WO
WIPO (PCT)
Prior art keywords
nozzle needle
current
peak value
fuel injector
armature
Prior art date
Application number
PCT/EP2017/060494
Other languages
German (de)
French (fr)
Inventor
Frank Denk
Gerd RÖSEL
Original Assignee
Continental Automotive Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Continental Automotive Gmbh filed Critical Continental Automotive Gmbh
Priority to US16/098,033 priority Critical patent/US10989154B2/en
Priority to KR1020187034580A priority patent/KR102161370B1/en
Priority to CN201780027553.8A priority patent/CN109072801B/en
Publication of WO2017191170A1 publication Critical patent/WO2017191170A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0685—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature and the valve being allowed to move relatively to each other or not being attached to each other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
    • F02D41/2464—Characteristics of actuators
    • F02D41/2467—Characteristics of actuators for injectors
    • F02D41/247—Behaviour for small quantities
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • F02D41/402—Multiple injections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • F02M51/066—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature and the valve being allowed to move relatively to each other or not being attached to each other
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
    • H01F7/1805—Circuit arrangements for holding the operation of electromagnets or for holding the armature in attracted position with reduced energising current
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/2003—Output circuits, e.g. for controlling currents in command coils using means for creating a boost voltage, i.e. generation or use of a voltage higher than the battery voltage, e.g. to speed up injector opening
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2044—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using pre-magnetisation or post-magnetisation of the coils
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2048—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit said control involving a limitation, e.g. applying current or voltage limits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2055—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit with means for determining actual opening or closing time
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2058—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using information of the actual current value
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/063—Lift of the valve needle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the present invention relates to the technical field of driving fuel injectors.
  • the present invention relates in particular to a method for driving a
  • Kraftstoffinj ectors with idle stroke for an internal combustion engine of a motor vehicle, wherein the Kraftstoffinj ector has a solenoid drive with a magnetic coil and a movable armature and a movable nozzle needle.
  • the present invention further relates to a motor controller and a computer program.
  • directly operated fuel injectors with solenoid drive also called Spuleneinspritzinj injectors
  • control parameter values in particular current and voltage values
  • the injectors are subjected to a specific voltage or current profile which usually begins with a boost phase in relation to the opening process.
  • a boost phase in relation to the opening process.
  • hydraulic ballistic operation in which the Kraftstoffinj ector is not fully opened
  • hydraulic static operation in which the Fuel injector is fully open and a time is kept open
  • at least a first holding phase and ge ⁇ optionally also a second hold phase (the actual hold phase) follows or follow.
  • injector concepts with idle stroke have proven to be advantageous.
  • the required electrical energy, the electric boost current can be designed to be smaller in principle, since the beginning of the hydraulic opening is driven not only by the applied magnetic force, but in addition by the armature pulse.
  • the present invention has for its object to provide an improved control for the hydraulic ballistic operation of Leerhubinj injectors, which can reduce or minimize in particular the above-mentioned scattering problems.
  • a method for driving a magnetic coil drive and a nozzle needle having Kraftstoffinj ector for an internal combustion engine of a motor vehicle wherein the solenoid drive comprises a magnetic coil and a movable armature, the Kraftstoffinj ektor a Leerhub between anchor and Having nozzle needle.
  • the described method comprises: (a) charging the solenoid actuator with a pre-charging current during a precharge phase in order to bring the movable armature in mechanical contact with the nozzle needle, and (b) subjecting the solenoid actuator with a clamping ⁇ voltage pulse during a boost phase to the Amperage of the current flowing through the solenoid reaches a predetermined peak value.
  • the method described is based on the finding that the above-described variation in the injection quantities of fuel injectors with the idle stroke by placing the injector in a state without a load stroke is greatly reduced or counteracted ent ⁇ .
  • boost phase refers in particular to a phase of driving a fuel injector in which the fuel injector is subjected to an increased voltage (for example approximately 65 V) (compared with the battery voltage, which is typically 12 V, for example) to initiate or initiate a rapid opening of the fuel injector, and is terminated by the current of the current flowing through the solenoid reaches a predetermined peak value (also called peak current).
  • an increased voltage for example approximately 65 V
  • the battery voltage which is typically 12 V, for example
  • the method according to the invention begins with a precharge phase in which the movable armature of the fuel injector is brought into mechanical contact with the nozzle needle in the sense that the armature is brought from its rest position into the position from the idle stroke without any major impulse. in which the hydraulically effective nozzle needle persists.
  • the fuel injector is placed in the so-called OPPl state during the precharge phase.
  • the Vorla ⁇ destrom is preferably kept so low that the armature is gently applied to the armature and remains there until further notice. This can be done for example by a current control, with a suitably low coil voltage is alternately switched on and off.
  • the pre-charge phase follows a boost phase.
  • the solenoid drive is now subjected to a (elevated) clamping ⁇ voltage pulse, which lasts a preparatory voted peak value of the coil current to reach, after which the
  • the fuel injector is at least partially opened and releases a certain amount of injection. Because of the preloading phase previously carried out, the initial conditions for the opening process are well defined here and scattering of the injection quantity (between injections with a fuel injector as well as between injections of different fuel injectors with the same injection parameters) will be very low or negligible.
  • the peak value agreed massage ⁇ is selected so that the nozzle needle carries out a ballistic movement.
  • the predetermined peak value is chosen so low that the nozzle needle follows a parabolic trajectory and does not hit the top (on the pole piece). The fuel injector is thus not fully opened.
  • the method further comprises re-energizing the solenoid drive with the precharge current to hold the movable armature in mechanical contact with the nozzle needle.
  • the movable armature is returned to the position achieved by the precharge phase, so that subsequent injection can occur at similar starting conditions.
  • the method further comprises applying the magnetic coil drive with a further voltage pulse during a further boost phase until the current strength of the current flowing through the magnetic coil reaches a further predetermined peak value.
  • the further predetermined peak value is selected so that the nozzle needle performs a further ballistic movement. According to a further embodiment of the invention, the further predetermined peak value is equal to the predetermined peak value.
  • the precharge current is selected so that there is substantially no movement of the nozzle needle during the precharge phase.
  • the precharge current is chosen so that the armature is quietly moved to the nozzle needle and there gently abuts and is decelerated.
  • an engine control system for a vehicle configured to use a method according to the first aspect and / or one of the above embodiments. This engine control makes it possible, by using the method according to the first aspect, to achieve injection quantities with very low dispersion in a simple manner.
  • a computer program is described which, when executed by a processor, is adapted to perform the method according to the first aspect and / or one of the above embodiments.
  • the computer program may be implemented as a computer-readable instruction code in any suitable programming language such as JAVA, C ++, etc.
  • the computer program can be stored on a computer-readable storage medium (CD-ROM, DVD, Blu-ray Disc, removable drive, volatile or non-volatile memory, built-in memory / processor, etc.).
  • the instruction code may program a computer or other programmable device such as, in particular, an engine control unit of a motor vehicle to perform the desired functions.
  • the computer program may be provided in a network, such as the Internet, from where it may be downloaded by a user as needed.
  • the invention can be implemented both by means of a computer program, i. software, as well as by means of one or more special electrical circuits, i. in hardware or in any hybrid form, i. using software components and hardware components.
  • Figure 1 shows an illustration of coil current, armature movement and nozzle needle movement with conventional control of a Kraftstoffinj ectors with idle stroke in ballistic ⁇ rule operation.
  • Figure 2 shows an illustration of coil current, armature movement and nozzle needle movement in inventive AnSteutation a Kraftstoffinj ectors with idle stroke in ballistic operation.
  • Figure 1 shows a diagram of coil current 11, armature movement 12 and movement of the nozzle needle 13 in conventional control of a fuel injector with an idle stroke in Ballis ⁇ automatic operation. More specifically, Figure 1 shows a current waveform 11 (as a function of time t) which increases from a certain point in time until a peak value is reached. The duration of this boost phase is indicated by Ti. Shortly after the beginning of the boost phase, the armature is moved upwards and then essentially describes a parabolic movement, as illustrated by the curve 12. The nozzle needle is only after a period designated Th from the beginning of Boost phase moves by the armature reaches the rest position A of the nozzle needle and entrains the nozzle needle. The nozzle needle then describes a parabolic movement, as shown by the curve 13. The fully open position of the fuel injector, marked B, is not reached.
  • the drive according to the invention begins with a precharging phase 24, in which the coil current 21 is regulated to a relatively low value, but which is sufficient to move the armature 22 quietly to the rest position of the nozzle needle A. Then follows a boost phase Ti, in which the current 21 until reaching the peak value
  • the coil current 21 returns to its initial value before the precharge phase (ie 0A), so that the armature also returns to its starting position. It should, however, be mentioned that in another embodiment the coil current 21 only goes back to the initially set precharging current, so that the armature remains in contact with the nozzle needle (position A) after the injection process and thus a subsequent injection under similar conditions how the first injection can be done.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

The invention relates to a method for actuating a fuel injector for an internal combustion engine of a motor vehicle, said fuel injector having a solenoid drive and a nozzle needle, wherein the solenoid drive has a solenoid and a movable armature, and the fuel injector has an idle stroke between the armature and the nozzle needle. The method has the following steps: (a) applying a pre-charging current to the solenoid drive during a pre-charging phase in order to bring the movable armature into mechanical contact with the nozzle needle, and (b) applying a voltage pulse to the solenoid drive during a boost phase until the current strength of the current flowing through the solenoid reaches a specified peak value. The invention also relates to a motor controller and a computer program.

Description

Beschreibung description
Verfahren zum Betreiben eines Kraftstoffinj ektors mit Leerhub Die vorliegende Erfindung betrifft das technische Gebiet der Ansteuerung von Kraftstoffinj ektoren . Die vorliegende Erfindung betrifft insbesondere ein Verfahren zum Ansteuern eines Method for operating a fuel injector with idle stroke The present invention relates to the technical field of driving fuel injectors. The present invention relates in particular to a method for driving a
Kraftstoffinj ektors mit Leerhub für einen Verbrennungsmotor eines Kraftfahrzeuges, wobei der Kraftstoffinj ektor einen Magnetspulenantrieb mit einer Magnetspule und einem beweglichen Anker und eine bewegliche Düsennadel aufweist. Die vorliegende Erfindung betrifft des Weiteren eine Motorsteuerung und ein Computerprogramm. Bei Betrieb von direkt betriebenen Kraftstoffinj ektoren mit Magnetspulenantrieb (auch Spuleneinspritzinj ektoren genannt) mit gleichen Ansteuerungsparameterwerte (insbesondere Strom- und Spannungswerte) kommt es generell aufgrund von elektrischen, magnetischen und mechanischen Toleranzen zu unterschiedlichen zeitlichen Öffnungs- und Schließverhalten der einzelnen Injektoren und somit zu Variationen in der jeweiligen Ein- spritzmenge . Kraftstoffinj ectors with idle stroke for an internal combustion engine of a motor vehicle, wherein the Kraftstoffinj ector has a solenoid drive with a magnetic coil and a movable armature and a movable nozzle needle. The present invention further relates to a motor controller and a computer program. When operating directly operated fuel injectors with solenoid drive (also called Spuleneinspritzinj injectors) with the same control parameter values (in particular current and voltage values) is due to electrical, magnetic and mechanical tolerances to different timing opening and closing behavior of the individual injectors and thus to variations in the respective injection quantity.
Die relativen Einspritzmengenunterschiede von Injektor zu Injektor vergrößern sich bei kürzer werdenden Einspritzzeiten. Bisher waren diese relativen Mengenunterschiede klein und ohne praktische Bedeutung. Die Entwicklung in Richtung kleinerer Einspritzmengen und Einspritzzeiten führt aber dazu, dass der Einfluss von den relativen Mengenunterschieden nicht mehr außer Betracht gelassen werden kann. The relative injection quantity differences from injector to injector increase with shorter injection times. So far, these relative differences in quantity were small and without practical significance. The trend towards smaller injection quantities and injection times, however, means that the influence of the relative quantity differences can no longer be disregarded.
Die Injektoren werden für den Betrieb mit einem bestimmten zeitlichen Spannungs- bzw. Stromprofil beaufschlagt, das in Bezug auf den Öffnungsvorgang üblicherweise mit einer Boostphase beginnt. Für den sogenannten hydraulisch ballistischen Betrieb (bei dem der Kraftstoffinj ektor nicht vollständig geöffnet wird) endet die Ansteuerung direkt nach der Boostphase, wobei für den sogenannten hydraulisch statischen Betrieb (bei dem der Kraftstoffinj ektor vollständig geöffnet und eine Zeitlang offengehalten wird) zumindest eine erste Haltephase und ge¬ gebenenfalls auch eine zweite Haltephase (die eigentliche Haltephase) folgt bzw. folgen. For operation, the injectors are subjected to a specific voltage or current profile which usually begins with a boost phase in relation to the opening process. For the so-called hydraulic ballistic operation (in which the Kraftstoffinj ector is not fully opened) ends the control directly after the boost phase, wherein for the so-called hydraulic static operation (in which the Fuel injector is fully open and a time is kept open), at least a first holding phase and ge ¬ optionally also a second hold phase (the actual hold phase) follows or follow.
Für den hydraulisch statischen Betrieb, insbesondere bei hohen Betriebsnenndrucken von z.B. 500 Bar, haben sich Injektorkonzepte mit Leerhub als vorteilhaft erwiesen. Die benötigte elektrische Energie, der elektrische Booststrom kann prinzipiell kleiner ausgelegt werden, da der Beginn der hydraulischen Öffnung nicht nur durch die anliegende Magnetkraft, sondern zusätzlich durch den Ankerimpuls getrieben wird. For hydraulically static operation, especially at high rated operating pressures of e.g. 500 bar, injector concepts with idle stroke have proven to be advantageous. The required electrical energy, the electric boost current can be designed to be smaller in principle, since the beginning of the hydraulic opening is driven not only by the applied magnetic force, but in addition by the armature pulse.
Wenn ein solcher Kraftstoffinj ektor mit Leerhub nun im hyd- raulisch ballistischen Betrieb verwendet wird, kommt es unter Umständen vor, dass die Einspritzung von Kraftstoff erfolgt, indem die Öffnung nur durch den Ankerimpuls getrieben wird und der die Magnetkraft erzeugende Strom bereits abgeschaltet ist. Die Einspritzmengen unterliegen in diesem Falle erfahrungsgemäß einer höheren Streuung, was wahrscheinlich auf die fehlendeIf such a fuel injector with idle stroke is now used in hydraulic ballistic operation, it may happen that the injection of fuel occurs by the opening is driven only by the armature pulse and the magnetic force generating power is already turned off. The injection quantities are subject in this case, experience shows a higher dispersion, which is probably due to the missing
Magnetkraft und damit verbundene Stabilität zurückzuführen ist. Magnetic force and related stability is due.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine verbesserte Ansteuerung für den hydraulisch ballistischen Betrieb von Leerhubinj ektoren bereitzustellen, die insbesondere die oben erwähnten Streuungsprobleme reduzieren bzw. minimieren kann . The present invention has for its object to provide an improved control for the hydraulic ballistic operation of Leerhubinj injectors, which can reduce or minimize in particular the above-mentioned scattering problems.
Diese Aufgabe wird gelöst durch die Gegenstände der unabhängigen Patentansprüche. Vorteilhafte Ausführungsformen der vorlie¬ genden Erfindung sind in den abhängigen Ansprüchen beschrieben. This object is solved by the subject matters of the independent claims. Advantageous embodiments of the vorlie ¬ constricting invention are described in the dependent claims.
Gemäß einem ersten Aspekt der Erfindung wird ein Verfahren zum Ansteuern eines einen Magnetspulenantrieb und eine Düsennadel aufweisenden Kraftstoffinj ektors für einen Verbrennungsmotor eines Kraftfahrzeuges beschrieben, wobei der Magnetspulenantrieb eine Magnetspule und einen beweglichen Anker aufweist, wobei der Kraftstoffinj ektor einen Leerhub zwischen Anker und Düsennadel aufweist. Das beschriebene Verfahren weist folgendes auf: (a) Beaufschlagen des Magnetspulenantriebs mit einem Vorladestrom während einer Vorladephase, um den beweglichen Anker in mechanischen Kontakt mit der Düsennadel zu bringen, und (b) Beaufschlagen des Magnetspulenantriebs mit einem Span¬ nungspuls während einer Boostphase bis die Stromstärke des durch die Magnetspule fließenden Stromes einen vorbestimmten Spitzenwert erreicht. Dem beschriebenen Verfahren liegt die Erkenntnis zugrunde, dass die eingangs erläuterte Streuung der Einspritzmengen bei Kraftstoffinj ektoren mit Leerhub durch Versetzen des Injektors in einen Zustand ohne Leerhub erheblich reduziert bzw. ent¬ gegengewirkt wird. According to a first aspect of the invention, a method for driving a magnetic coil drive and a nozzle needle having Kraftstoffinj ector for an internal combustion engine of a motor vehicle is described, wherein the solenoid drive comprises a magnetic coil and a movable armature, the Kraftstoffinj ektor a Leerhub between anchor and Having nozzle needle. The described method comprises: (a) charging the solenoid actuator with a pre-charging current during a precharge phase in order to bring the movable armature in mechanical contact with the nozzle needle, and (b) subjecting the solenoid actuator with a clamping ¬ voltage pulse during a boost phase to the Amperage of the current flowing through the solenoid reaches a predetermined peak value. The method described is based on the finding that the above-described variation in the injection quantities of fuel injectors with the idle stroke by placing the injector in a state without a load stroke is greatly reduced or counteracted ent ¬.
In diesem Dokument bezeichnet „Boostphase" insbesondere eine Phase der Ansteuerung eines Kraftstoffinj ektors , in welcher der Kraftstoffinj ektor mit einer (gegenüber der Batteriespannung, die zum Beispiel typisch 12V beträgt) erhöhten Spannung (zum Beispiel ca. 65V) beaufschlagt wird. Die Boostphase dient dazu, eine schnelle Öffnung des Kraftstoffinj ektors zu schaffen bzw. einzuleiten, und wird beendet, indem die Stromstärke des durch die Magnetspule fließenden Stromes einen vorbestimmten Spitzenwert (auch Peakstrom genannt) erreicht. In this document, "boost phase" refers in particular to a phase of driving a fuel injector in which the fuel injector is subjected to an increased voltage (for example approximately 65 V) (compared with the battery voltage, which is typically 12 V, for example) to initiate or initiate a rapid opening of the fuel injector, and is terminated by the current of the current flowing through the solenoid reaches a predetermined peak value (also called peak current).
Das erfindungsgemäße Verfahren beginnt mit einer Vorladephase, in welcher der bewegliche Anker des Kraftstoffinj ektors in dem Sinne in mechanischen Kontakt mit der Düsennadel gebracht wird, dass der Anker aus seiner Ruhelage ohne großen bzw. wesentlichen Impuls aus dem Leerhub heraus in die Stellung gebracht wird, bei der die hydraulisch wirksame Düsennadel verharrt. Mit anderen Worten wird der Kraftstoffinj ektor während der Vorladephase in den sogenannten OPPl-Zustand gebracht. Dabei wird der Vorla¬ destrom vorzugsweise so niedrig gehalten, dass der Anker sanft an dem Anker angelegt wird und dort bis auf weiteres verbleibt. Dies kann zum Beispiel durch eine Stromregelung erfolgen, wobei eine passend niedrige Spulenspannung abwechselnd ein- und ausgeschaltet wird. Nach der Vorladephase folgt eine Boostphase. Mit anderen Worten wird der Magnetspulenantrieb nun mit einem (erhöhten) Span¬ nungspuls beaufschlagt, der bis zum Erreichen einem vorbe- stimmten Spitzenwert des Spulenstroms dauert, wonach dieThe method according to the invention begins with a precharge phase in which the movable armature of the fuel injector is brought into mechanical contact with the nozzle needle in the sense that the armature is brought from its rest position into the position from the idle stroke without any major impulse. in which the hydraulically effective nozzle needle persists. In other words, the fuel injector is placed in the so-called OPPl state during the precharge phase. In this case, the Vorla ¬ destrom is preferably kept so low that the armature is gently applied to the armature and remains there until further notice. This can be done for example by a current control, with a suitably low coil voltage is alternately switched on and off. After the pre-charge phase follows a boost phase. In other words, the solenoid drive is now subjected to a (elevated) clamping ¬ voltage pulse, which lasts a preparatory voted peak value of the coil current to reach, after which the
Spannung abgeschaltet wird, damit die Stromstärke wieder ab¬ fallen kann. Dadurch wird der Kraftstoffinj ektor zumindest teilweise geöffnet und gibt eine gewisse Einspritzmenge frei. Wegen der zuvor durchgeführten Vorladephase sind die An- fangsbedingungen für den Öffnungsvorgang hier wohl definiert und eine Streuung der Einspritzmenge (zwischen Einspritzvorgängen mit einem Kraftstoffinj ektor sowohl als auch zwischen Ein- spritzvorgängen verschiedener Kraftstoffinj ektoren mit gleichen Einspritzparameter) wird sehr niedrig bzw. vernachlässigbar sein. Voltage is switched off, so that the current can fall ¬ again. As a result, the fuel injector is at least partially opened and releases a certain amount of injection. Because of the preloading phase previously carried out, the initial conditions for the opening process are well defined here and scattering of the injection quantity (between injections with a fuel injector as well as between injections of different fuel injectors with the same injection parameters) will be very low or negligible.
Gemäß einem Ausführungsbeispiel der Erfindung ist der vorbe¬ stimmte Spitzenwert so gewählt, dass die Düsennadel eine ballistische Bewegung durchführt. Mit anderen Worten ist der vorbestimmte Spitzenwert so niedrig gewählt, dass die Düsennadel einer parabelförmigen Flugbahn folgt und nicht oben (am Polstück) anschlägt. Der Kraftstoffinj ektor wird somit nicht vollständig geöffnet . Gemäß einem weiteren Ausführungsbeispiel der Erfindung weist das Verfahren ferner ein erneutes Beaufschlagen des Magnetspulenantriebs mit dem Vorladestrom auf, um den beweglichen Anker in mechanischem Kontakt mit der Düsennadel zu halten. Hier wird der bewegliche Anker mit anderen Worten nach der Einspritzung zurück in die durch die Vorladephase erzielte Stellung gebracht, damit eine nachfolgende Einspritzung bei ähnlichen bzw. identischen Startbedingungen erfolgen kann. Dies wird vorzugsweise mit einer geeigneten Regelung gemacht, die die Stromstärke bis zum Vorladestrom abfallen lässt und dann auf diesem Wert verbleiben lässt. Gemäß einem weiteren Ausführungsbeispiel der Erfindung weist das Verfahren ferner ein Beaufschlagen des Magnetspulenantriebs mit einem weiteren Spannungspuls während einer weiteren Boostphase bis die Stromstärke des durch die Magnetspule fließenden Stromes einen weiteren vorbestimmten Spitzenwert erreicht auf. According to one embodiment of the invention, the peak value agreed vorbe ¬ is selected so that the nozzle needle carries out a ballistic movement. In other words, the predetermined peak value is chosen so low that the nozzle needle follows a parabolic trajectory and does not hit the top (on the pole piece). The fuel injector is thus not fully opened. According to another embodiment of the invention, the method further comprises re-energizing the solenoid drive with the precharge current to hold the movable armature in mechanical contact with the nozzle needle. Here, in other words, after the injection, the movable armature is returned to the position achieved by the precharge phase, so that subsequent injection can occur at similar starting conditions. This is preferably done with a suitable control that drops the current to the precharge current and then leaves it at that value. According to a further embodiment of the invention, the method further comprises applying the magnetic coil drive with a further voltage pulse during a further boost phase until the current strength of the current flowing through the magnetic coil reaches a further predetermined peak value.
In diesem Ausführungsbeispiel erfolgt eine weitere Einspritzung, wobei eine Streuung in der Einspritzmenge in ähnlicher Wiese wie bei der vorhergehenden Einspritzung vermieden wird. In this embodiment, a further injection takes place, wherein a scatter in the injection quantity is avoided in a similar manner as in the previous injection.
Gemäß einem weiteren Ausführungsbeispiel der Erfindung ist auch der weitere vorbestimmte Spitzenwert so gewählt, dass die Düsennadel eine weitere ballistische Bewegung durchführt. Gemäß einem weiteren Ausführungsbeispiel der Erfindung ist der weitere vorbestimmte Spitzenwert gleich dem vorbestimmten Spitzenwert . According to a further embodiment of the invention, the further predetermined peak value is selected so that the nozzle needle performs a further ballistic movement. According to a further embodiment of the invention, the further predetermined peak value is equal to the predetermined peak value.
In diesem Falle folgen somit zwei im Wesentlichen identische Einspritzungen aufeinander. In this case, two substantially identical injections thus follow one another.
Gemäß einem weiteren Ausführungsbeispiel der Erfindung ist der Vorladestrom so gewählt, dass im Wesentlichen keine Bewegung der Düsennadel während der Vorladephase stattfindet. According to a further embodiment of the invention, the precharge current is selected so that there is substantially no movement of the nozzle needle during the precharge phase.
Mit anderen Worten ist der Vorladestrom so gewählt, dass der Anker ruhig bis zur Düsennadel hin bewegt wird und dort sanft anschlägt und abgebremst wird. Gemäß einem zweiten Aspekt der Erfindung wird eine Motorsteuerung für ein Fahrzeug beschrieben, die zum Verwenden eines Verfahrens gemäß dem ersten Aspekt und/oder einem der obigen Ausführungsbeispiele eingerichtet ist. Diese Motorsteuerung ermöglicht es durch Verwendung des Verfahrens gemäß dem ersten Aspekt, Einspritzmengen mit sehr niedriger Streuung in einfacher Weise zu erzielen. Gemäß einem dritten Aspekt der Erfindung wird ein Computerprogramm beschrieben, welches, wenn es von einem Prozessor ausgeführt wird, eingerichtet ist, das Verfahren gemäß dem ersten Aspekt und/oder einem der obigen Ausführungsbeispiele durchzuführen . In other words, the precharge current is chosen so that the armature is quietly moved to the nozzle needle and there gently abuts and is decelerated. In accordance with a second aspect of the invention, an engine control system for a vehicle configured to use a method according to the first aspect and / or one of the above embodiments is described. This engine control makes it possible, by using the method according to the first aspect, to achieve injection quantities with very low dispersion in a simple manner. According to a third aspect of the invention, a computer program is described which, when executed by a processor, is adapted to perform the method according to the first aspect and / or one of the above embodiments.
Im Sinne dieses Dokuments ist die Nennung eines solchen Com¬ puterprogramms gleichbedeutend mit dem Begriff eines Pro¬ gramm-Elements, eines Computerprogrammprodukts und/oder eines computerlesbaren Mediums, das Anweisungen zum Steuern eines Computersystems enthält, um die Arbeitsweise eines Systems bzw. eines Verfahrens in geeigneter Weise zu koordinieren, um die mit dem erfindungsgemäßen Verfahren verknüpften Wirkungen zu erreichen . For the purposes of this document is the mention of such Com ¬ computer program equivalent to the concept of a Pro ¬ program element, a computer program product and / or a computer-readable medium containing instructions for controlling a computer system to the operation of a system or a method in to coordinate suitably to achieve the effects associated with the method according to the invention.
Das Computerprogramm kann als computerlesbarer Anweisungscode in jeder geeigneten Programmiersprache wie beispielsweise in JAVA, C++ etc. implementiert sein. Das Computerprogramm kann auf einem computerlesbaren Speichermedium (CD-Rom, DVD, Blu-ray Disk, Wechsellaufwerk, flüchtiger oder nicht-flüchtiger Speicher, eingebauter Speicher/Prozessor etc.) abgespeichert sein. Der Anweisungscode kann einen Computer oder andere programmierbare Geräte wie insbesondere ein Steuergerät für einen Motor eines Kraftfahrzeugs derart programmieren, dass die gewünschten Funktionen ausgeführt werden. Ferner kann das Computerprogramm in einem Netzwerk wie beispielsweise dem Internet bereitgestellt werden, von dem es bei Bedarf von einem Nutzer heruntergeladen werden kann. The computer program may be implemented as a computer-readable instruction code in any suitable programming language such as JAVA, C ++, etc. The computer program can be stored on a computer-readable storage medium (CD-ROM, DVD, Blu-ray Disc, removable drive, volatile or non-volatile memory, built-in memory / processor, etc.). The instruction code may program a computer or other programmable device such as, in particular, an engine control unit of a motor vehicle to perform the desired functions. Further, the computer program may be provided in a network, such as the Internet, from where it may be downloaded by a user as needed.
Die Erfindung kann sowohl mittels eines Computerprogramms, d.h. einer Software, als auch mittels einer oder mehrerer spezieller elektrischer Schaltungen, d.h. in Hardware oder in beliebig hybrider Form, d.h. mittels Software-Komponenten und Hardware-Komponenten, realisiert werden. The invention can be implemented both by means of a computer program, i. software, as well as by means of one or more special electrical circuits, i. in hardware or in any hybrid form, i. using software components and hardware components.
Es wird darauf hingewiesen, dass Ausführungsformen der Erfindung mit Bezug auf unterschiedliche Erfindungsgegenstände be¬ schrieben wurden. Insbesondere sind einige Ausführungsformen der Erfindung mit Verfahrensansprüchen und andere Ausführungsformen der Erfindung mit Vorrichtungsansprüchen beschrieben. Dem Fachmann wird jedoch bei der Lektüre dieser Anmeldung sofort klar werden, dass, sofern nicht explizit anders angegeben, zusätzlich zu einer Kombination von Merkmalen, die zu einem Typ von Erfindungsgegenstand gehören, auch eine beliebige Kombination von Merkmalen möglich ist, die zu unterschiedlichen Typen von Erfindungsgegenständen gehören. Weitere Vorteile und Merkmale der vorliegenden Erfindung ergeben sich aus der folgenden beispielhaften Beschreibung einer bevorzugten Ausführungsform. It should be noted that embodiments of the invention have been described with reference to different subject matters ¬ . In particular, some embodiments are the Invention with method claims and other embodiments of the invention with device claims described. However, it will be readily apparent to those skilled in the art upon reading this application that, unless explicitly stated otherwise, in addition to a combination of features belonging to a type of subject matter, any combination of features that may result in different types of features is also possible Subject matters belong. Further advantages and features of the present invention will become apparent from the following exemplary description of a preferred embodiment.
Figur 1 zeigt eine Darstellung von Spulenstrom, Ankerbewegung und Düsennadelbewegung bei herkömmlicher Ansteuerung eines Kraftstoffinj ektors mit Leerhub im ballisti¬ schen Betrieb. Figure 1 shows an illustration of coil current, armature movement and nozzle needle movement with conventional control of a Kraftstoffinj ectors with idle stroke in ballistic ¬ rule operation.
Figur 2 zeigt eine Darstellung von Spulenstrom, Ankerbewegung und Düsennadelbewegung bei erfindungsgemäßer AnSteuerung eines Kraftstoffinj ektors mit Leerhub im ballistischen Betrieb. Figure 2 shows an illustration of coil current, armature movement and nozzle needle movement in inventive AnSteuerung a Kraftstoffinj ectors with idle stroke in ballistic operation.
Es wird darauf hingewiesen, dass die nachfolgend beschriebenen Ausführungsformen lediglich eine beschränkte Auswahl an möglichen Ausführungsvarianten der Erfindung darstellt. It should be noted that the embodiments described below represent only a limited selection of possible embodiments of the invention.
Die Figur 1 zeigt eine Darstellung von Spulenstrom 11, Ankerbewegung 12 und Düsennadelbewegung 13 bei herkömmlicher Ansteuerung eines Kraftstoffinj ektors mit Leerhub im ballis¬ tischen Betrieb. Spezifischer zeigt die Figur 1 einen Stromverlauf 11 (als Funktion der Zeit t) , der ab einem bestimmten Zeitpunkt bis zum Erreichen eines Spitzenwertes ansteigt. Die Zeitdauer dieser Boostphase ist mit Ti gekennzeichnet. Kurz nach Beginn der Boostphase wird der Anker nach oben bewegt und beschreibt dann im Wesentlichen einer parabelförmigen Bewegung, wie es anhand der Kurve 12 dargestellt wird. Die Düsennadel wird erst nach einer mit Th bezeichneten Zeitdauer ab Beginn der Boostphase bewegt, indem der Anker die Ruheposition A der Düsennadel erreicht und die Düsennadel mitnimmt. Auch die Düsennadel beschreibt dann eine parabelförmige Bewegung, wie es anhand der Kurve 13 dargestellt wird. Die ganz offene Stellung des Kraftstoffinj ektors , die mit B gekennzeichnet ist, wird nicht erreicht . 1 shows a diagram of coil current 11, armature movement 12 and movement of the nozzle needle 13 in conventional control of a fuel injector with an idle stroke in Ballis ¬ automatic operation. More specifically, Figure 1 shows a current waveform 11 (as a function of time t) which increases from a certain point in time until a peak value is reached. The duration of this boost phase is indicated by Ti. Shortly after the beginning of the boost phase, the armature is moved upwards and then essentially describes a parabolic movement, as illustrated by the curve 12. The nozzle needle is only after a period designated Th from the beginning of Boost phase moves by the armature reaches the rest position A of the nozzle needle and entrains the nozzle needle. The nozzle needle then describes a parabolic movement, as shown by the curve 13. The fully open position of the fuel injector, marked B, is not reached.
Die Figur 2 zeigt eine Darstellung von Spulenstrom 21, Ankerbewegung 22 und Düsennadelbewegung 23 bei erfindungsgemäßer Ansteuerung eines Kraftstoffinj ektors mit Leerhub im ballis¬ tischen Betrieb. Spezifischer beginnt die erfindungsgemäße Ansteuerung mit einer Vorladephase 24, in der der Spulenstrom 21 auf einen relativ niedrigen Wert geregelt wird, welcher aber ausreicht, um den Anker 22 ruhig bis zur Ruheposition der Düsennadel A zu bewegen. Dann folgt eine Boostphase Ti, in der die Stromstärke 21 bis zum Erreichen des Spitzenwertes 2 shows a plot of coil current 21, armature movement 22 and movement of the nozzle needle 23 in accordance with the invention actuation of a fuel injector with an idle stroke in Ballis ¬ automatic operation. More specifically, the drive according to the invention begins with a precharging phase 24, in which the coil current 21 is regulated to a relatively low value, but which is sufficient to move the armature 22 quietly to the rest position of the nozzle needle A. Then follows a boost phase Ti, in which the current 21 until reaching the peak value
(Peakstroms) ansteigt. Nach etwa der Hälfte der Zeitdauer der Boostphase Ti bewegt sich Anker und Düsennadel zusammen entlang einer parabelförmigen Bewegungskurve. In dem in der Figur 2 dargestellten Ausführungsbeispiel geht der Spulenstrom 21 zurück auf seinem Ausgangswert vor der Vorladephase (das heißt 0A) , so dass der Anker auch wieder zurück in seine Ausgangsposition kommt. Es soll aber erwähnt werden, dass der Spulenstrom 21 in einer anderen Ausführungsform nur bis zu dem anfangs einge- stellten Vorladestrom zurückgeht, so dass der Anker nach dem Einspritzvorgang in Kontakt mit der Düsennadel (Position A) verbleibt und somit eine nachfolgende Einspritzung bei ähnlichen Bedingungen wie die der ersten Einspritzung erfolgen kann. (Peak current) increases. After approximately half the duration of the boost phase Ti, the armature and the nozzle needle move together along a parabolic movement curve. In the exemplary embodiment illustrated in FIG. 2, the coil current 21 returns to its initial value before the precharge phase (ie 0A), so that the armature also returns to its starting position. It should, however, be mentioned that in another embodiment the coil current 21 only goes back to the initially set precharging current, so that the armature remains in contact with the nozzle needle (position A) after the injection process and thus a subsequent injection under similar conditions how the first injection can be done.
Bezugs zeichenliste Reference sign list
11 Stromverlauf 11 current course
12 Ankerposition  12 anchor position
13 Düsennadelposition 13 nozzle needle position
A Ausgangsposition der Düsennadel A Starting position of the nozzle needle
B Oberste Position der Düsennadel t Zeit B Top position of the nozzle needle t Time
Ti Boostphase  Ti boost phase
Th Zeitintervall Th time interval
21 Stromverlauf  21 current course
22 Ankerposition  22 anchor position
23 Düsennadelposition  23 nozzle needle position
24 Vorladephase  24 precharge phase
A Ausgangsposition der DüsennadelA Starting position of the nozzle needle
B Oberste Position der Düsennadel t Zeit B Top position of the nozzle needle t Time
Ti Boostphase  Ti boost phase

Claims

Patentansprüche claims
1. Verfahren zum Ansteuern eines einen Magnetspulenantrieb und eine Düsennadel aufweisenden Kraftstoffinj ektors für einen Verbrennungsmotor eines Kraftfahrzeuges, wobei der Magnet¬ spulenantrieb eine Magnetspule und einen beweglichen Anker aufweist, wobei der Kraftstoffinj ektor einen Leerhub zwischen Anker und Düsennadel aufweist, das Verfahren aufweisend 1. A method of driving a a solenoid actuator and a nozzle needle having fuel injector for an internal combustion engine of a motor vehicle, wherein the magnet coil drive ¬ has a magnet coil and a movable armature, wherein the fuel injector an idle stroke between the armature and the nozzle needle has, the method comprising
- Beaufschlagen des Magnetspulenantriebs mit einem Vorlade¬ strom während einer Vorladephase, um den beweglichen Anker in mechanischen Kontakt mit der Düsennadel zu bringen, und- Applying the solenoid drive with a precharge ¬ current during a precharge phase to bring the movable armature into mechanical contact with the nozzle needle, and
- Beaufschlagen des Magnetspulenantriebs mit einem Span¬ nungspuls während einer Boostphase bis die Stromstärke des durch die Magnetspule fließenden Stromes einen vorbestimmten Spitzenwert erreicht. - Actuation of the solenoid drive with a voltage ¬ voltage pulse during a boost phase until the current strength of the current flowing through the solenoid reaches a predetermined peak value.
2. Verfahren gemäß dem vorhergehenden Anspruch, wobei der vorbestimmte Spitzenwert so gewählt ist, dass die Düsennadel eine ballistische Bewegung durchführt. 2. The method according to the preceding claim, wherein the predetermined peak value is selected so that the nozzle needle performs a ballistic movement.
3. Verfahren gemäß einem der vorhergehenden Ansprüche, ferner aufweisend ein erneutes Beaufschlagen des Magnetspulenantriebs mit dem Vorladestrom, um den beweglichen Anker in mechanischem Kontakt mit der Düsennadel zu halten. 3. The method of claim 1, further comprising recharging the solenoid drive with the precharge current to hold the moveable armature in mechanical contact with the nozzle needle.
4. Verfahren gemäß dem vorhergehenden Anspruch, ferner aufweisend ein Beaufschlagen des Magnetspulenantriebs mit einem weiteren Spannungspuls während einer weiteren Boostphase bis die Stromstärke des durch die Magnetspule fließenden Stromes einen weiteren vorbestimmten Spitzenwert erreicht. 4. The method according to the preceding claim, further comprising applying the solenoid drive with a further voltage pulse during a further boost phase until the current strength of the current flowing through the magnetic coil reaches a further predetermined peak value.
5. Verfahren gemäß dem vorhergehenden Anspruch, wobei der weitere vorbestimmte Spitzenwert so gewählt ist, dass die Düsennadel eine weitere ballistische Bewegung durchführt. 5. The method according to the preceding claim, wherein the further predetermined peak value is selected so that the nozzle needle performs a further ballistic movement.
6. Verfahren gemäß Anspruch 4 oder 5, wobei der weitere vorbestimmte Spitzenwert gleich dem vorbestimmten Spitzenwert ist . A method according to claim 4 or 5, wherein the further predetermined peak value is equal to the predetermined peak value.
7. Verfahren gemäß einem der vorhergehenden Ansprüche, wobei der Vorladestrom so gewählt ist, dass im Wesentlichen keine Bewegung der Düsennadel während der Vorladephase stattfindet. 7. The method according to any one of the preceding claims, wherein the precharge is selected so that there is substantially no movement of the nozzle needle during the precharge phase.
8. Motorsteuerung für ein Fahrzeug, die zum Verwenden eines Verfahrens gemäß einem der vorhergehenden Ansprüche eingerichtet ist . 8. A motor controller for a vehicle, which is adapted to use a method according to one of the preceding claims.
9. Computerprogramm, welches, wenn es von einem Prozessor ausgeführt wird, eingerichtet ist, das Verfahren gemäß einem der Ansprüche 1 bis 7 durchzuführen. A computer program which, when executed by a processor, is arranged to perform the method according to one of claims 1 to 7.
PCT/EP2017/060494 2016-05-03 2017-05-03 Method for operating a fuel injector with an idle stroke WO2017191170A1 (en)

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